1

Unlikely:
You need to call your doctor right now since you appear to be having an exacerbation in your asthma probably triggered by a viral infection. I greatly doubt that it is related to your OC intake.
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Asthma is a disease of the lungs caused by chronic inflammation of the airways most often caused by allergies. This inflammation results in airway swelling and hyperactivity leading to difficulty breathing, shortness of breath, dry cough, etc. MIT is a diagnosis made by combining clinical suspicion and spirometry data.
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5

Yes:
It's very common for asthmatics to be triggered by the cold. You can use your inhaler beforehand. Are you on a maintenance inhaled steroid? I'm glad you're taking a proactive approach to you disease -- it's very helpful. Thanks for asking and i wish you luck.
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Tightness can mean different states at distinctive times. The most common is the complaint of tightness of chest, a feeling of discomfort, real or perceived, seen often in patients with asthma or panic disorder, or heart attack. Your physician will decide the cause.
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